In the near future, much of the world has been forgotten at the bottom of the ocean due to rising sea levels. Natsuki Ikaruga, who lives in a small town surrounded and stranded by the sea, is invited by a mysterious woman, Catherine, to search for a treasure in his grandmother's house who was a marine geologist. One day, he dives to the bottom of the ocean in a submarine and encounters a mysterious capsule with a girl sleeping inside. The girl was a humanoid so sophisticated that she could be mistaken for a human.
Is it strange that I'm so happy?
هل من الغريب أن أكون بهذه السّعادة؟
War es komisch, mich zu freuen?
¿Es raro que me alegre?
¿Es raro que me alegre?
Tu trouves ma réaction étrange ?
È strano che sia felice?
É estranho que eu fique feliz com isso?
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